Btrfs: fix an oops when deleting snapshots

[pandora-kernel.git] / fs / btrfs / btrfs_inode.h

diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 52d7eca..d9f99a1 100644 (file)
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -34,6 +34,9 @@ struct btrfs_inode {
         */
        struct btrfs_key location;
 
+       /* Lock for counters */
+       spinlock_t lock;
+
        /* the extent_tree has caches of all the extent mappings to disk */
        struct extent_map_tree extent_tree;
 
@@ -134,8 +137,8 @@ struct btrfs_inode {
         * items we think we'll end up using, and reserved_extents is the number
         * of extent items we've reserved metadata for.
         */
-       atomic_t outstanding_extents;
-       atomic_t reserved_extents;
+       unsigned outstanding_extents;
+       unsigned reserved_extents;
 
        /*
         * ordered_data_close is set by truncate when a file that used
@@ -173,7 +176,11 @@ static inline u64 btrfs_ino(struct inode *inode)
 {
        u64 ino = BTRFS_I(inode)->location.objectid;
 
-       if (ino <= BTRFS_FIRST_FREE_OBJECTID)
+       /*
+        * !ino: btree_inode
+        * type == BTRFS_ROOT_ITEM_KEY: subvol dir
+        */
+       if (!ino || BTRFS_I(inode)->location.type == BTRFS_ROOT_ITEM_KEY)
                ino = inode->i_ino;
        return ino;
 }
@@ -184,4 +191,13 @@ static inline void btrfs_i_size_write(struct inode *inode, u64 size)
        BTRFS_I(inode)->disk_i_size = size;
 }
 
+static inline bool btrfs_is_free_space_inode(struct btrfs_root *root,
+                                      struct inode *inode)
+{
+       if (root == root->fs_info->tree_root ||
+           BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID)
+               return true;
+       return false;
+}
+
 #endif